Description:
This project was originally
conceived as a way to have a small temperature chamber on
every engineers bench without the expense of buying a larger
than needed commercial unit. The idea of using a pelter
device to make a small chamber was in my head for several
years - this project came to fruition when small commercial
car coolers came on the market. I added a PIC
Microprocessor, some relays, a power supply and was in
business.
The project turned out so
handy that it was published in the January 2004 Circuit
Cellar Magazine.
As with all of my
microprocessor projects this one is also controllable via
RS232 / USB to allow complete computer
controllability.
If you are interested in
building this project you should order a reprint of the
January 2004 issue from Circuit
Cellar - I have a
limited supply of PIC16F876 Microprocessors that I can sell
to support the project. You should contact me with the
shipping location so I can tell you the full price with
shipping. If you can program your own PIC, the complete code
and a detailed parts list is available free from the Circuit
Cellar website.
Specifications:
Temperature
range.................8 to 60 Degrees C
25 to 50 Deg C Slew
Time...... 12 Minutes
Stead state
error............... < 1.5 degrees C p-p
Control............................... Rotary
encoder / RS232 / USB
Display............................... LCD with
set point and actual temperature
Power................................. 115
VAC
Here is a screen
capture of the oven being controlled via an RS232 link with
Agilent VEE. The quick response along with the low steady
state error are evident.
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